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頁籤選單縮合
題 名 | 不同水分狀態下重金屬銅在土壤中分配情形之研究=The Study of Heavy Metal Copper Distribution in Soil at Various Water Content |
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作 者 | 張大偉; | 書刊名 | 農業工程學報 |
卷 期 | 42:1 1996.03[民85.03] |
頁 次 | 頁92-96+23 |
分類號 | 434.223 |
關鍵詞 | 吸附作用; 分配係數; 固態效應; Adsorption; Partition coefficient; Solid effect; |
語 文 | 中文(Chinese) |
中文摘要 | 在土壤中重金屬吸附之研究上,常以批次實驗或管柱實驗來求取重金屬在土壤中的分配係數,在這些實驗中均利用大量的溶液與少量的土壤進行反應,惟這與田間實際狀態並不一致。本研究係利用不同比例的氯化銅溶液與土壤進行批次實驗,以溶液與土壤的比例來表示土壤水分狀態,用以探討在不同濃度與不同水土比例下,重金屬在土壤固液兩相中分配的情形,以期更能了解土壤中重金屬的吸附作用。 由研究結果顯示,當加入的溶液經由高速離心分離後所回收的體積隨著水土比之降低而減少,這是因為土壤相對含量增加使得土壤孔隙體積也增加了,更多的溶液被土壤吸收成為毛管水與吸著水。另外隨著水土比的降低土壤溶液流動不易,無法與土壤粒子充分混合均勻而被吸附,而且經過總土壤量予以平均後,單位重的土壤吸附量並沒有增加反而有減少的趨勢,土壤溶液平衡濃度亦降低許多,這種現象便是實際田間狀態下的土壤稀釋作用,此時重金屬離子在固液兩相中的分配係數會隨著水土比率的降低而降低,這可以用所謂的固態效應加以解釋。 |
英文摘要 | On the studies of heavy metals adsorbed by soils, batch and column experiments were used to measure heavy metals' partition coefficient in soils. Experiments were conducted by using a mass of solution and minor soil sample. However, it does not like real conditions of agricultural field. In this study, the batch experiments were conducted by using several different ratios of CuCl₂ solution to soil sample which express the various soil moisture regime. Therefore, we can understand more detail of heavy metals' distribution between solid and liquid phase. This study was shown, because of the relative amount of soil increased, more solution absorbed by soil to be capillary and hydroscopic water. Therefore, the recovery of added CuCl₂ solution decreases with solution to soil ratio. According to the ratio of solution to soil decreased, soil solution would to be slowly flow which result in both adsorption amount per soil weight and equilibrium concentration of soil solution decrease, partition coefficient decrease too. Soil dilution and solid effect would be a good explanation for this phenomenon. |
本系統中英文摘要資訊取自各篇刊載內容。